高增益自放大自发辐射自由电子激光器中的基波与谐波微聚束

Fundamental and harmonic microbunching in a high-gain self-amplified spontaneous-emission free-electron laser.

作者信息

Tremaine A, Wang X J, Babzien M, Ben-Zvi I, Cornacchia M, Murokh A, Nuhn H-D, Malone R, Pellegrini C, Reiche S, Rosenzweig J, Skaritka J, Yakimenko V

机构信息

NSLS, Brookhaven National Lab, Upton, NY 11973, USA.

出版信息

Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Sep;66(3 Pt 2B):036503. doi: 10.1103/PhysRevE.66.036503. Epub 2002 Sep 30.

DOI:10.1103/PhysRevE.66.036503

PMID:12366273

Abstract

Electron beam microbunching in both the fundamental and second harmonic in a high-gain self-amplified spontaneous emission free-electron laser (SASE FEL) was experimentally characterized using coherent transition radiation. The microbunching factors for both modes (b(1) and b(2)) approach unity, an indication of FEL saturation. These measurements are compared to the predictions of FEL simulations. The simultaneous capture of the microbunching and SASE radiation for individual micropulses correlate the longitudinal electron beam structure with the FEL gain.

摘要

利用相干渡越辐射对高增益自放大自发辐射自由电子激光（SASE FEL）中基波和二次谐波的电子束微聚束进行了实验表征。两种模式（b(1) 和 b(2)）的微聚束因子都接近1，这表明自由电子激光达到了饱和。将这些测量结果与自由电子激光模拟的预测结果进行了比较。对单个微脉冲的微聚束和SASE辐射的同时捕获，将纵向电子束结构与自由电子激光增益关联起来。